On auroral ion conics and electron beams acceleration

Details On auroral ion conics and electron beams acceleration On auroral ion conics and electron beams acceleration

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.4309m&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 23, p. 4309-4312

Physics

8

Ionosphere: Auroral Ionosphere, Ionosphere: Particle Acceleration, Ionosphere: Ionosphere/Magnetosphere Interactions, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions

Scientific paper

The results of a numerical simulation of the O+ energization perpendicular to the magnetic field (B) in ``electrostatic shocks'' with converging or diverging fields at altitudes ~2000 km are presented. It is shown that non-adiabatic motion in diverging ``shocks'' leads to the formation of coherent perpendicular O+ beams, whereas converging fields produce non-Maxwellian tails and heating of core ions. In both cases, ion energization is accompanied by the formation of spatially narrow density dips. Inside these dips, double layers may easily be formed resulting in electron acceleration upwards or downwards depending on whether the electric field diverges or converges. The results are in qualitative agreement with relevant observations.

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